Coloured contact lenses enhance the eye's appearance by changing the colour of the iris (coloured part of the eye). These lenses are made up of coloured dots and radial-coloured lines that mimic the natural iris pattern to give a realistic appearance. Coloured lenses used for cosmetic purposes usually have a transparent central portion surrounded by the coloured portion. These lenses do not hamper your vision or colour perception. Figure 1 describes the location of the iris (coloured part of the…